package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    //添加购物车
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        // 判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && !list.isEmpty()) {
            ShoppingCart cart = list.get(0);
            // 修改这里：固定每次+1（不需要前端传参）
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
            return;
        }

        // 新增记录时固定设置数量为1
        shoppingCart.setNumber(1);

        // 若不存在,需要插入一条购物车数据
        Long dishId = shoppingCartDTO.getDishId();
        Long setmealId = shoppingCartDTO.getSetmealId();

        if (dishId != null) {
            Dish dish = dishMapper.getById(dishId);
            shoppingCart.setName(dish.getName());
            shoppingCart.setImage(dish.getImage());
            shoppingCart.setAmount(dish.getPrice());
        } else {
            Setmeal setmeal = setmealMapper.getById(setmealId);
            shoppingCart.setName(setmeal.getName());
            shoppingCart.setImage(setmeal.getImage());
            shoppingCart.setAmount(setmeal.getPrice());
        }

        shoppingCart.setCreateTime(LocalDateTime.now());
        shoppingCartMapper.insert(shoppingCart);
    }

    //查询购物车
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    //删除购物车
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }

    //删除购物车中的一个商品
    @Override
    public void deleteOne(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list!= null && list.size()>0) {
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //若数量为1，则删除购物车中的商品
                shoppingCartMapper.deleteOneByDishId(shoppingCartDTO.getDishId());
            }else{
                //若数量大于1，则更新购物车中的商品数量
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
